Molding machine



R. F RINGLE MOLDING MACHINE May 5, 1931.

3 Sheets-Sheet- Filed May 29. 1929 :1 INVENTOR R. F. RINGLE MOLDING MACHINE May 5, 1931.

Filed May 29. 1929 3 Sheets-Sheet r 2 Z 9 d May 5,

R. F. RINGLE MOLDING MACHINE Filed May 29, 1929 3 Sheets-Sheet 3 Patented May 5, 1931 UNITED STATES ENT OFFICE MOLDING MACHINE Application filed may 29, 1955 Serial No. 366,862.

My invention refers to improvements in molding machines of the general type illustrated in prior patent of Austin and Ringle N0. 1,243,030,0f October 16, 1917. It has in view to provide means for making operative engagement between the raising and lowering equalizing table and the flask for accurate engagement therebetween and for lowering the flask from the pattern after molding, and reversal of the flask.

Also, to provide an improved construction of cylinder for rotating the turnover shaft by mounting it on'trunnions whereby to avoid the necessity of an intervening connecting rod, and also by a novel arrangement of elevating mechanism for the equalizing table, utilizing a pair of raising and lowering cylinders located at opposite sides of said shaft, together with other features of construction and advantages in operation, as shall be more fully hereinafter described.

The complete molding machine and the present improvement are embodied in an entire operative mechanism including the j artained sand are vibrated or agitated, turnover mechanism by which the flask and the packed sand surrounding the pattern are elevated away from the jarring table and rotated one half revolution for location above the lowering mechanism, and such lowering mechanism and equalizing table and the actuating means therefor, as mentioned above.

In the drawings illustrating one preferred embodiment of the invention:

Fig. l is a general view in elevation, partly in section and partly broken away, showing the several main elements of the installation;

Fig. 2 is an end view of the same in elevation; 7

Fig. 3 is a partial view in elevation, similar to Fig. 1, showing the turnover arms and plate erected and with the equalizing table raised in supporting position underneath the 45 reversed flask;

Fig. 4 is a plan view of the machine. The turnover and flask lowering mechanism' is generally indicated at A and is in operative relation to the jarring machine B, 50 both of which are of well known construction ring table on which the flask and its conand generally similar to the apparatus shown in the above mentioned patent and also in a companion application filed herewith, Se-

rial No.

The jarring machine B is provided with the usua 1 table 2 upon which the flask 3 is supported with the intervening pattern supporting turnover plate 4. These elements, as

well as the vibrating mechanism for jarring the table are of well understood construction and operation, and need not be further described.

The turnover plate 4 is provided at each end with lateral socket projections 5 having tapered sockets for engagement by tapered trunnions 6 of the usual turnover arms 7 by which the plate a and flask 3 are swung over upwardly above the Withdrawing and equal izing table, as indicated in Fig. 3.

Arms

7 are mounted on rock-shaft 8 ex tending across in bearings 9 of the main frame of the machine and operatively connected by lever 10 by pivotal connection 11 with plunger rod 12 of plunger 13 of oscillating cylinder 14L.

Cylinder 14: is providedwith laterally arrange supporting trunnions 15 carried in bearings 16 at each side of the rear middle tive pres 1n revers sure may be supplied by conduit 18 ing the operation, the lowering however being mainly eflected by gravitation against the cushioning action of the contained impelling fluid subject to release by proper v As sho midway Rotati alve manipulation. wn, the cylinder 14 is mounted about across the main foundation frame of the machine, and is free to swing in either direction through suitable clearance between its bearings.

on of the turnover plate 4 and flask h and connected at 21 with trunnions 6 so that, as the turnover arms swing upwardly and over, the posltion of the flask is reversed above the equalizing table, as shown.

Flask 3 is provided with the usual bottom board and battens against which the contacting elements of the equalizing table engage when elevated.

Equalizing table 22 comprises a middle supporting base plate portion having oppo-.

sitely projecting extensions 23 which are fixedly mounted upon the upper ends of plungers 2 lof cylinders 25, located at opposite sides of the middle of the machine, and of the axial center of cylinder 14.

Cylinders 25, as shown, are ofl-set at diagonally opposite positions on one side and the other of shaft 8 for clearance, and are mounted upon the main foundation or bed plate D of the machine. By such construction, when fluid pressure is simultaneouslyapplied to the cylinders, the plungers 24 will. be raised together, maintaining the equalizing table in a horizontal position at all times.

Cylinder 25 is provided with a supply conduit 26 with suitable valve control for raising and lowering the plungers at desired speed. A supplemental similarly controlled conduit 27 supplies pressure to the lower extension 28 of cylinder 25, provided with a bufling spring 29 for cushioning the plungers at the termination of their downward movement.

As shown, the table 22-23 is bolted to the upper end of opposite plungers 24, and these are provided with, surrounding protecting shells 30 in telescoping engagement with coacting shells 31, for exclusion of dust or other foreign matter.

Table 2223 is provided along each side with resiliently mounted contact bars or rails 32 having upper contacting edges for engagement against the under side of the battens or other surface portions of the under side of the reversed flask 3. The rails 32, are so mounted that their contacting edges will independently engage against the surface to be supported and will automatically adjust themselves thereto, one independently of the other, upon coming into contact therewith, whereby to entirely support the flask when fixed in such position for positive and accurate lowering thereof, without danger of harmful variation of the flask and molded sand in withdrawal from the pattern.

For such purpose each rail is mounted by portions intermediate of its ends upon resisting cushioning springs 33 seated in casings 34 therefor of the rails, and bearing downwardly against the upper side of the equalizing table by terminal caps 35.

As thus constructed, as the equalizing table is brought upwardly into contact with the under side of the inverted flask and with the slight pressure present at the upward end of the stroke of plungers 24, each rail will automatically accommodate itself to such under side, either in parallelism or with more or less deflection at one side or the other or rails themselves lie inwardly against or in close proximity to the outer side faces of up; standing posts or abutments 36, arranged along each side of the middle portion 22 of the equalizing table, against which the rails are to be tightly clamped and held against accidental or other movement during lowering of the table.

F or such purpose I provide a lever 37 having transverse adjusting bolts 38 -39, pivotally connected at 40 withinwardly extending lugs of rails 32.. The opposite end of lever 37 is connected at 41 with the terminal of piston rod 42 of the plunger 43 in cylinder 44:, mounted on the table, as, in Fig. 4. When it is desired to fixedly hold the rails 32 in tight abutting contact with posts 36, pressure is applied to plunger 43 by flexibly connected conduit 45 from any source of pres-. sure, sub ect to the opening and closing of a suitable control valve, not shown, at any convenient location within reach of the operator.

WVhen thus tightly clamped, and the flask 3 has been released from the turnover plate by removal of clamps 46, the flask resting evenly and stably on the edges of rails 32 may be positively and evenly lowered downwardly below the pattern so that the turnover plate may then be returned to its initial position over the bumper, and the pattern removed for substitution by an additional )attern and flask.

The lowering of the flask under control of the valve or valves of conduits 2627 is at first comparatively slow and then more rapidly, or for any'desired variation in speed under controlof the operating valve, as will be readily understood.

The construction and operation of the invention will be readily understood and appreciated from the foregoing description,

and it will be found to be continuously efficient and to avoid the usual objections and trouble incident to improper or variable lowering of the flask, avoiding any even slight variation, and resulting in a perfectly formed mold cavity.

The accurate raising and lowering of the equalizing table is facilitated and improved by the use of the plural cylinders located and operting as described, while the mounting of the turnover cylinder 14 insures accurate and reliable operation, and the cylinder itself is entirely self-contained and directacting on the shaft levers.

lVhat I claim is 1. Turnover and flask withdrawing mechanism for a molding machine comprising a turnover plate, turnover arms and an actuating shaft therefor having an operating lever, a pivotally mounted cylinder having a plunger directly connected with the lever, an equalizing table above the cylinder, and plungers and cylinders therefor one on each opposite side of the actuating shaft.

2. Turnover and flask withdrawing mechanism for a molding machine comprising a turnover plate, turnover arms and means effecting partial rotation of the plate, an actuating shaft for the turnover arms having a lever, a cylinder provided with trunnion bearings and a plunger having a stem directly connected with the shaft lever, means supplying pressure to the cylinder, an equalizing table above the cylinder, and plungers and cylinders therefor arranged at diagonally opposite posit-ions one on each side of the actuating shaft. 7

3. In a molding'machine, the combination with a pair of turnover arms operatively connected with a turnover plate adapted to loeats a flask on a bumping machine and to elevate it in reversed position above an equalizing table, an operating shaft for the turnover arms, means for actuating said arms, and an equalizing table provided with a plurality ofelevating and lowering cylin ders and plungers diagonally arranged one on each opposite side of the operating shaft.

4:. In a molding machine, the combination with a pair of turnover arms operatively connected with a turnoverplate adapted to locate a flask on a bumping machine and to elevate it in reversed position above an equalizing table, a shaft operatively connected with the turnover arms and having a lever, a plunger directly connected with said lever and provided with a trunnion supported cylinder, a cylinder located at each diagonally opposite side of the shaft having a plunger, and an equalizing table on said plungers.

5. In a molding machine, the combination with a pair of turnover arms operatively connected with a turnover plate adapted to locate a flask on a bumping;machine and to elevate it in reversed position above an equalizing table, a shaft operatively connected with the turnover arms and having a lever, a plunger directly connected with said lever and pro vided with a trunnion supported cylinder, a cylinder located at each diagonally opposite side of the shaft having a plunger, and an equalizing table on said plungers provided with resiliently mounted flask supporting elements.

6. In a molding machine, the combination with a pair of turnover arms operatively connected with a turnover plate adapted to 10- eats a flask on a bumping machine and to elevate it in reversed position above an equalizing table, a shaft operatively connected with the turnover arms and'having a lever, a plunger directly connected with said lever and provided with a trunnion supported cylinder, a cylinder located at each diagonally opposite side of the shaft having a plunger, and an equalizing table on said plungers provided with resiliently mounted flask supporting elements and means for holding them fixedly in position.

7. In combination, a supporting frame, a rotating shaft having endmost bearing supports thereon, turnover arms on the ends of said shaft connected with a turnover plate and having reversing rods connected therewith, an oscillating cylinder mounted in trunnion bearings and provided with a plunger, lever arms on the shaft between its bearings directly connected with the plunger, a pair of diagonally located plunger cylinders one at each diagonally opposite side of the shaft provided with raising and lowering plungers, and an equalizing table mounted on said plungers having flask engaging supports.

8. In combination, a supporting frame, a rotating shaft having endmost bearing supports thereon, turnover arms on the ends of said shaft connected with a turnover plate and having reversing rods connected therewith, an oscillating cylinder mounted in trunnion bearings and provided with a plunger, lever arms on the shaft between its bearings directly connected with the plunger, a pair of diagonally located plunger cylinders one at each opposite side of the shaft provided with raising and lowering plungers, and an equalizing table mounted on said plungers having flask engaging supports and means providing for independent movement of said supports and for fixedly holding them in position.

In testimony whereof I hereunto aflix my signature.

ROBERT F. RINGLE. 

